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qntz

Vector quantization primitives for approximate nearest neighbor search: RaBitQ (1-8 bit), ternary quantization, bit packing, and Hamming distance. Backed by a Rust implementation.

Python bindings for the qntz Rust crate.

Install

pip install qntz

Quick start

import qntz

# RaBitQ quantization (1-8 bits per dimension)
dim = 32
quantizer = qntz.RaBitQQuantizer(dim, seed=42, total_bits=4)
vector = [float(i) * 0.1 for i in range(dim)]
qv = quantizer.quantize(vector)
query = [float(i) * 0.05 for i in range(dim)]
dist = quantizer.approximate_distance(query, qv)

# Ternary quantization ({-1, 0, +1} per dimension)
tq = qntz.TernaryQuantizer(4, threshold_high=0.3, threshold_low=-0.3, normalize=False)
a = tq.quantize([0.5, -0.5, 0.1, -0.1])
b = tq.quantize([0.5, 0.5, 0.0, -0.5])
sim = qntz.ternary_cosine_similarity(a, b)

# Bit packing and Hamming distance
packed_a = qntz.pack_binary([1, 0, 1, 0, 1, 0, 1, 0])
packed_b = qntz.pack_binary([1, 1, 1, 0, 0, 0, 1, 0])
dist = qntz.hamming_distance(packed_a, packed_b)  # 2

API

Name Description
RaBitQQuantizer Quantizer using randomized Hadamard rotation, 1-8 bits/dim
RaBitQQuantizer.fit Fit centroid from training vectors
RaBitQQuantizer.quantize Quantize a single vector, returns QuantizedVector
RaBitQQuantizer.approximate_distance Approximate Euclidean distance to a quantized vector
RaBitQQuantizer.approximate_l2_sqr Approximate squared L2 distance to a quantized vector
TernaryQuantizer Maps each dimension to {-1, 0, +1} via thresholds
TernaryQuantizer.fit Fit adaptive thresholds from training vectors
TernaryQuantizer.quantize Quantize a single vector, returns TernaryVector
pack_binary Pack 0/1 values into a compact bitfield
unpack_binary Unpack a bitfield back to one byte per bit
hamming_distance Hamming distance between two packed bit-vectors
asymmetric_inner_product f32 query vs packed 1-bit codes inner product
asymmetric_l2_squared f32 query vs packed 1-bit codes L2 squared
ternary_inner_product Inner product between two ternary vectors
ternary_cosine_similarity Cosine similarity between two ternary vectors
ternary_hamming Hamming distance between two ternary vectors
ternary_asymmetric_inner_product f32 query vs ternary codes inner product
ternary_asymmetric_cosine_distance f32 query vs ternary codes cosine distance

numpy support

All functions accept numpy arrays or Python lists. Packed outputs are numpy uint8 arrays.

License

MIT OR Apache-2.0

Release files for qntz 0.1.3

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Built distributions (wheels)

Table of built distributions (wheels) for qntz 0.1.3
File
qntz-0.1.3-pp311-pypy311_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl PyPy 3.11 PyPy 3.11 7.3 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-pp311-pypy311_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl PyPy 3.11 PyPy 3.11 7.3 Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp315-cp315t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp315-cp315-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.15 CPython 3.15 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp314-cp314t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp314-cp314-win_amd64.whl CPython 3.14 CPython 3.14 Windows x86-64 Details
qntz-0.1.3-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp314-cp314-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp314-cp314-macosx_11_0_arm64.whl CPython 3.14 CPython 3.14 macOS 11.0+ ARM64 Details
qntz-0.1.3-cp314-cp314-macosx_10_12_x86_64.whl CPython 3.14 CPython 3.14 macOS 10.12+ x86-64 Details
qntz-0.1.3-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details
qntz-0.1.3-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp313-cp313-macosx_11_0_arm64.whl CPython 3.13 CPython 3.13 macOS 11.0+ ARM64 Details
qntz-0.1.3-cp313-cp313-macosx_10_12_x86_64.whl CPython 3.13 CPython 3.13 macOS 10.12+ x86-64 Details
qntz-0.1.3-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details
qntz-0.1.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp312-cp312-macosx_11_0_arm64.whl CPython 3.12 CPython 3.12 macOS 11.0+ ARM64 Details
qntz-0.1.3-cp312-cp312-macosx_10_12_x86_64.whl CPython 3.12 CPython 3.12 macOS 10.12+ x86-64 Details
qntz-0.1.3-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details
qntz-0.1.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.17+ ARM64 Details
qntz-0.1.3-cp311-cp311-macosx_11_0_arm64.whl CPython 3.11 CPython 3.11 macOS 11.0+ ARM64 Details
qntz-0.1.3-cp311-cp311-macosx_10_12_x86_64.whl CPython 3.11 CPython 3.11 macOS 10.12+ x86-64 Details
qntz-0.1.3-cp310-cp310-win_amd64.whl CPython 3.10 CPython 3.10 Windows x86-64 Details
qntz-0.1.3-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.17+ x86-64 Details
qntz-0.1.3-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl CPython 3.10 CPython 3.10 Linux glibc 2.17+ ARM64 Details

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